linux-kernel - Re: [PATCH V2] perf test: Basic branch counter support

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Date:   Mon, 20 Nov 2023 16:22:24 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     acme@...nel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, jolsa@...nel.org, namhyung@...nel.org,
        adrian.hunter@...el.com, tinghao.zhang@...el.com
Subject: Re: [PATCH V2] perf test: Basic branch counter support

On Mon, Nov 13, 2023 at 8:12 AM Liang, Kan <kan.liang@...ux.intel.com> wrote:
>
> Hi Ian,
>
> On 2023-11-07 1:40 p.m., kan.liang@...ux.intel.com wrote:
> > From: Kan Liang <kan.liang@...ux.intel.com>
> >
> > Add a basic test for the branch counter feature.
> >
> > The test verifies that
> > - The new filter can be successfully applied on the supported platforms.
> > - The counter value can be outputted via the perf report -D
> >
> > Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> > ---
> >
> > Changes since V2:
> > - Update the output msg for the skipped case (Ian)
> >
>
> Any comments for this patch?

Confirmed the wildcard works as expected.
Tested-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> Thanks,
> Kan
>
> >  tools/perf/tests/shell/record.sh | 30 ++++++++++++++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> >
> > diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
> > index 4fbc74805d52..cc207a16ae24 100755
> > --- a/tools/perf/tests/shell/record.sh
> > +++ b/tools/perf/tests/shell/record.sh
> > @@ -11,6 +11,9 @@ err=0
> >  perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
> >  testprog="perf test -w thloop"
> >  testsym="test_loop"
> > +cpu_pmu_dir="/sys/bus/event_source/devices/cpu*"
> > +br_cntr_file="/caps/branch_counter_nr"
> > +br_cntr_output="branch stack counters"
> >
> >  cleanup() {
> >    rm -rf "${perfdata}"
> > @@ -154,10 +157,37 @@ test_workload() {
> >    echo "Basic target workload test [Success]"
> >  }
> >
> > +test_branch_counter() {
> > +  echo "Basic branch counter test"
> > +  # Check if the branch counter feature is supported
> > +  for dir in $cpu_pmu_dir
> > +  do
> > +    if [ ! -e "$dir$br_cntr_file" ]
> > +    then
> > +      echo "branch counter feature not supported on all core PMUs ($dir) [Skipped]"
> > +      return
> > +    fi
> > +  done
> > +  if ! perf record -o "${perfdata}" -j any,counter ${testprog} 2> /dev/null
> > +  then
> > +    echo "Basic branch counter test [Failed record]"
> > +    err=1
> > +    return
> > +  fi
> > +  if ! perf report -i "${perfdata}" -D -q | grep -q "$br_cntr_output"
> > +  then
> > +    echo "Basic branch record test [Failed missing output]"
> > +    err=1
> > +    return
> > +  fi
> > +  echo "Basic branch counter test [Success]"
> > +}
> > +
> >  test_per_thread
> >  test_register_capture
> >  test_system_wide
> >  test_workload
> > +test_branch_counter
> >
> >  cleanup
> >  exit $err